Thermostat Repair Procedures

Removal and Installation

Removing the thermostat will adversely affect cooling efficiency and lead to reduced cooling performance. Do not remove the thermostat, even if the engine overheats.

1. 1
   Disconnect the negative (-) battery cable from the battery.
2. 2
   Drain the engine coolant so that the level is below the thermostat. (Refer to Cooling System - "Coolant")
3. 3
   Remove the water inlet pipe. (Refer to Cooling System - "Water Temperature Control Assembly")
4. 4
   Remove the coolant inlet hose (A).

   Tightening torque: 7.8 ~ 11.8 N·m

   

5. 5
   Remove the thermostat (A).

   

   Install the thermostat with the jiggle valve facing up.

6. 6
   To install, reverse the removal procedure.

Inspection

1. 1
   Immerse the thermostat in water and gradually heat the water.

   

2. 2
   Check the valve opening temperature. Valve opening temperature: 88 ± 2 °C (190.4 ± 3.6 °F). Full-open temperature: 100 °C (212 °F). If the valve opening temperature is not as specified, replace the thermostat.
3. 3
   Check the valve lift.

   Valve lift: 10 mm (0.3937 in) or more at 100 °C

   If the valve lift is not as specified, replace the thermostat.